Vill 
SEGREGATA (from segregalus, separated), Each floret 
having its own peculiar involucrum. 
The 23rd class, POLYGAMIA, contains two orders, 
formed exactly on the same principles as the 21st and 
22nd classes, called Monasc1a and DIŒCIA. 
The 24th class, CRYPTOGAMIA, contains nine orders, 
chiefly formed from the reproductive organs, which it is un- 
necessary to describe here further than to give the names 
and examples. First, Frnices, Ferns. Examples, Polypo- 
dium, Osmunda, Aneimia, Ophioglossum, &c. Second, 
~ chantia. 
INTRODUCTION. 
EQuISETACES, Horsetails. Example, Equisetum. Third, 
LYCOPODINEÆ, Club-mosses. Example, Lycopodium. 
Fourth, MARSILEACE. Examples, Jsoetes and Pilularia. 
Fifth, Musc1, Mosses. Examples, Phascum Hypnum, &c. 
Sixth, HEPATIC#. Examples, Jangermannia and Mar- 
Seventh, ALG, Sea-weeds. Examples, Exil- 
aria, Nostoc, Conferva, Ulva, Spherococcus, Fucus, &c. 
Eighth, LICHENES, Example, Lichens. Ninth, FUNGI. 
Examples, Agaricus, Clavaria, Morchella, Peziza, Sphe- 
ria, &c. 
GENERAL MANAGEMENT OF PLANTS GROWN UNDER GLASS. 
Although we have given an account of the propagation and culture of the various GENERA in the 
body of the work, we think it expedient to describe the general management of ornamental plants 
grown under glass, such as greenhouse, stove, or hothouse, as well as alpine plants. 
1. Alpine plants are such as will not grow in the open ground to any perfection, and must 
be protected during winter by a frame; they are mostly natives of high situations, among rocks 
and on the tops of mountains, and consequently of low growth, seldom, if ever, exceeding six inches. 
They should be grown in small pots, and will all thrive well in a mixture of loam, peat, and sand, the 
pots to be always well drained with potsherds ; they should be shifted at least twice every season, and 
divided if the plant has grown too large; the mould which has been shaken from the pots, if not ex- ‘ 
hausted, to be mixed with new earth, and the plants potted afresh, after which they require a little 
water. 
2. Greenhouse plants are suchas are natives of the Canary Islands, 
Good Hope, and other countries in the s 
this country; therefore they are kept 
a strong frost is expected during the night. 
in the afternoon, if cold. 
expel the damp, as greenhouse pl 
should be looked over every day, 
be removed with a flat stick, but not so dee 
instead. Towards spring they require 
this may be about the middle of May, 
time for setting them out, when the 
should be previously prepared for them. 
greenhouse plants into fresh pots and mo 
If these instructions are attended to, alpine plants will always look healthy and neat. 
New Holland, and the Cape of 
ame latitudes, which only require to be protected from frost in 
under glass during the winter. 
No fire is requisite, unless 
In winter they should have plenty of air given them 
upon fine days, as early in the day as the weather will permit; 
If the weather continues damp and 
the house to be shut up very early 
wet, then a little fire is requisite to 
ants are more likely to be injured by damp than cold. The plants 
taking off any dead leaves, and watering those that are dry; this 
should be done early in the forenoon, and if the surface of the mould in 
the pots becomes green, it should 
p as to injure the roots, and a little fresh mould laid on 
7 a more plentiful supply of air and water, and when frost is not 
apprehended some of the sashes should be left a little o 
the weather advances towards summer, until the time of 
pen all night, and the air gradually admitted as 
setting the plants out of doors: in some seasons 
in others not until the end. Calm cloudy weather is the best 
most sheltered situation should 
be chosen, where a bed of ashes 
There are various opinions as to the best time of shifting 
uld, but we think that the earliest spring time should be pre- 
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